JPH0628781A - System for revising length of audio data - Google Patents

Abstract

PURPOSE:To reduce the burden of a user and to uniformly hold natural feeling in original audio data by performing concrete processing for revising the entire length of audio data to a required value by running an application program. CONSTITUTION:When the audio data whose length is the object of revision and the required value on the entire length are inputted from a keyboard 35, the required value 47 is sent to a soundless section revision processing part 45. In parallel with that, the actual length of the audio data regenerated from a hard disk 33 and an individual soundless section are detected by an entire length confirming part 43 and a soundless section detection part 44, and an entire length value 48 and soundless section information as well are sent to the processing part 45. Then, by the processing part 45, sundless section revision information 50 is made which is used for compressing or expanding by a differential between the required value 47 and the entire length value 48 from the information 49. Then, by a new audio data making and processing part 46, the length of the soundless section in the original audio data is revised based on the information 50 and a new audio data whose entire length coincides with the required value is made, is stored in the disk 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing the length of audio data, and in particular, for audio data used as one of multimedia, by adjusting the length of a silent section according to a predetermined rule. The present invention relates to a method for changing the length of audio data in which the total length is changed to a desired value.

[0002] In recent years, as data to be processed by a computer, a multimedia including conventional numeric data and character data plus audio data and video data has been used. When using this multimedia, correspondence between various data is used. Therefore, the present invention meets such a request for audio data which is one medium.

[0003]

2. Description of the Related Art Conventionally, when the total length of arbitrary audio data is changed to a desired value, a user reproduces the audio data whose length is to be changed from a storage medium such as a disk, and the total length or the length of a silent section. By checking
He instructed the information necessary for the previous change process.

That is, when the reproduction time is shorter than a desired value required for synchronizing with other kinds of data, the user specifies the portion and length of the silent data to be added, and the reproduction time of the previous time. When is longer than the desired value, it is necessary to specify the silent portion to be deleted and its length.

Upon receiving this instruction, the processor side performs processing such as adding silent data to the audio data whose length is to be changed or deleting a part of the silent section of the audio data according to the instruction content. , We are creating new audio data with a changed total length.

Next, the user reproduces the new audio data, confirms whether the total length of the new audio data matches the desired value, and if it is still insufficient, repeats the above process.

[0007]

As described above, in the conventional audio data length changing method, the user reproduces the audio data for which the length is to be changed and then gives an instruction to delete / add silent data. Therefore, there is a problem that the content of the instruction reflects the individual judgment of the user, which causes an unnatural hearing of the new audio data, and above all, the user's burden becomes heavy. It was

Therefore, in the present invention, the user simply operates the input unit to specify the desired length of the audio data whose length is to be changed, and the desired value for the entire length of the audio data. The application program is in charge of instructing and executing, for example, deletion and addition of a silent section necessary to match the time with the desired value, thereby reducing the burden on the user and ensuring the naturalness of the original audio data. The purpose is to be able to hold like.

[0009]

According to the present invention, by running an application program, audio data instructed by a user is read from a recording medium and its total length is confirmed, and a difference between this confirmation value and a desired value designated by the user is read. The silent section deletion or addition mode for eliminating the silent section is determined according to a preset rule, and the silent section length changing process is performed based on the determined content.

FIG. 1 illustrates the principle of the present invention. In the figure, reference numeral 1 denotes an input unit, which inputs audio data whose length is to be changed, a desired value for the total length of the audio data, and the like by a user operation. An application program 2 executes processing for changing the total length of the audio data designated by the input unit 1 to its desired value. Reference numeral 3 denotes a recording medium, for example, a magnetic disk or the like is used, and a plurality of audio data such as new audio data after the length changing process is recorded.

Here, the processing procedure in the application program 2 recognizes the audio data whose length is to be changed and the desired value for the total length thereof, which is designated by the input section 1, and proceeds to the next step. This audio data is read from the recording medium 3, the total length thereof is recognized, the position and length of the silent section are individually detected, and the process proceeds to the next step. The difference between this total length value and the previous desired value is obtained, and the process proceeds to the next step. The length of the silent section of the previous audio data is adjusted by this difference based on various rules shown in the part of the embodiment described later, and the process proceeds to the next step. The adjusted new audio data is recorded on the recording medium 3. Has become.

[0012]

According to the present invention, as described above, any audio data
When adjusting the total length of the audio data in order to ensure the synchronization between the data and other multi-data such as numerical data and document data, the user needs to change the length of the audio data. By specifying the data and setting the desired value for its total length, and letting the application program take charge of the subsequent processing for changing the length of the audio data, the burden on the user side is reduced and the original The audio data has a naturalness as an audio signal.

FIG. 2 is an explanatory diagram showing the relationship between the original audio data and the new audio data, which is "00 ... 00".
The part of "" is a silent part, the part of "11 ... 11" is a part with a sound, and the numbers "0" and "1" in the figure are digital audio data of a predetermined number of bits, for example, 16 bits. Is equivalent to.

Here, (a) is new audio data created by deleting the beginning and end silences of the original audio data and shortening the silences in the middle, and (b) is the original audio data. 3 shows new audio data created by lengthening a silent portion in the middle of the audio data.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 3 is an explanatory diagram showing a hardware configuration example of the present invention, in which 31 is a CPU, 32 is a memory, 33 is a hard disk, and 34 is a hard disk.
Is a display, 35 is a keyboard, 36 is a D / A converter,
37 shows the speakers respectively. Here, CPU31
The application program for controlling the operation of is different between the present invention and the conventional one.

FIG. 4 is a functional block diagram for executing the audio data length changing process of the present invention. 41 is a length changing processing unit, 42 is a desired value (total length) receiving processing unit, and 43 is a total length. A confirmation unit, 44 is a silent section detection processing section, 45 is a silent section change processing section, 46 is a new audio data creation processing section, 47 is a desired value for the total length of the audio data whose length is to be changed, and 48 is this audio data. The actual total length value, 49 is the silent position information indicating the start position and length of each silent interval, 50
Indicates silent section change information, 51 indicates original audio data (audio data whose length is to be changed), and 52 indicates new audio data (see FIG. 5 for 49 and 50).

Here, the user uses the keyboard 35 to input the desired value for the audio data whose length is to be changed and its total length.
When input from, the desired value 47 is sent to the silent section change processing unit 45 via the desired value reception processing unit 42.

In parallel with this, the actual length of the audio data reproduced from the hard disk 33 is detected by the full length confirmation section 43, and the individual silent sections of this audio data are detected by the silent section detection processing section 44. Then, the total length value 48 and the silent section information 49 are also sent to the silent section change processing unit 45.

The total length confirmation unit 43 recognizes the previous total length value from the data length information stored in the header portion of the reproduced audio data and the size of the recording area occupied by the audio data on the hard disk 33. is doing.

Next, the silent section change processing unit 45 uses the silent section information 49 to reduce or expand the length of the silent section of the audio data by the difference between the desired value 47 and the actual total length value 48. The section change information 50 is created.

Next, a new audio data creation processing unit 46
Changes the length of the silent section of the original audio data on the basis of the silent section change information 50, thereby creating new audio data whose total length matches the previous desired value and stores this new audio data in the hard disk. Stored in 33.

By reproducing the new audio data on the hard disk 33 via the D / A converter 36, the speaker 37, etc., the user can monitor whether or not the overall length is a predetermined value. Yes (see Figure 3).

Here, as a method of detecting a silent section, the sections in which audio data does not reach a certain level are all silent sections. There are methods such as interval.

The rules for regularly shortening the total length of the original audio data, that is, for deleting the silent data by a predetermined length are as follows: All silent intervals in the audio data are deleted by the same length.・ Delete all silent intervals in audio data at the same rate. ・ Delete all silent intervals in audio data according to their lengths, for example, long silent intervals are deleted at a higher rate than short silent intervals. -Silence sections at the beginning and end of audio data are deleted preferentially, and if this is insufficient, other silence sections are deleted. Note that the method of preferentially shortening the beginning and end silent sections of audio data is that the naturalness of the reproduced sound is not as good as deleting the silent sections in the middle of the audio data even if these silent sections are shortened. It utilizes the auditory characteristic of being hard to be discouraged.

The rules for regularly extending the total length of the original audio data, that is, for adding a predetermined amount of silence data to the silence interval are as follows: Exclude the silence interval at the beginning and end of the audio data. Add silence data of the same length to all silence intervals.-Add silence data of the same proportion to all silence intervals except the beginning and end silence intervals of audio data. All silent sections except the trailing silent section have a length corresponding to each length,
For example, a long silent section has a high proportion of silent data added to a short silent section.

FIG. 5 is an explanatory diagram showing an example of the silent section information and the silent section change information. The length of the beginning silent section of the original audio data is changed from "45" to "0" and the original audio is changed. It indicates that the length of the silent section from the data start position "280" is changed from "27" to "13".

The respective rules for shortening or extending the total length of the original audio data as described above are merely examples, and random intervals for each silent section are obtained without such regularity. Needless to say, an application program may be used in which the total length of the audio data is set to a desired value while using a rule such as various shortening or expanding.

The system for changing the total length of audio data according to the present invention is not effective only for audio data recorded in digital format, but for audio data recorded in analog format. But it can be used.

[0029]

According to the present invention, as described above,
Since the specific processing for changing the total length of the audio data to the desired value is performed by running the application program, the silent interval length is determined by the user after actually listening to the audio data to be processed. Compared with the conventional method of instructing the degree of shortening / expansion of a new audio data, the new user can reduce the burden on the user, and the new audio data that does not impair the natural feeling held by the original audio data. Can be expected to be created uniformly.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between original audio data and new audio data according to the present invention.

FIG. 3 is an explanatory diagram showing a hardware configuration example of the present invention.

FIG. 4 is a functional block diagram for executing an audio data length changing process according to the present invention.

FIG. 5 is an explanatory diagram showing an example of silent section information and silent section change information of the present invention.

[Explanation of symbols]

 In FIG. 1, 1 ... Input unit 2 ... Application program 3 ... Recording medium

Claims (2)

[Claims] 1. A method for changing a length of audio data, wherein a length of a silent section in the audio data is adjusted to change a total length of the audio data to a desired value. The audio data to be changed is specified and the desired value for the total length is input, and then the specified audio data is read from the recording medium and the total length is recognized by running the application program. , The position and length of the silent section are individually detected, and the length of the silent section is adjusted according to a predetermined rule by the difference between the recognition value and the desired value. A method of changing the length of audio data, wherein the adjusted total length is set to the desired value. 2. The audio data length changing method according to claim 1, wherein digital recording data is used as the audio data.